If you are planning on overhauling you OM 603 Diesel turbo charger the first thing you must do is determine which turbo you have. In this video Kent explains the differences between these two turbos. Similar in design by no parts are interchangeable. Coming up with affordable overhaul kits will be a challenge - especially for the KKK. These turbos were used on the 1986 to 1987 300SDL, 300D and 300TD as well as the 1990 to 1991 350SD and 350SDL. They were also used on the early 140 Chassis S class diesels. Watch Part 2 for updates on repair kit and component availability.